1.
Calculate Temperature Differential (rT°F)
rT°F = Inlet Water Temperature (°F) -Leaving Chill Water Temperature
rT°F = Inlet Water Temperature (°F) -Leaving Chill Water Temperature
2.
Calculate BTU/hr.
BTU/hr. = Gallons per hr x 8.33 x rT°F
BTU/hr. = Gallons per hr x 8.33 x rT°F
3. Calculate tons of cooling capacity
Tons = BTU/hr. ÷ 12,000
4. Over Size Chiller by 20%
Example
: What size chiller is required to cool 40GPM from 70°F to
58°F
1. rT°F = 70°F - 58°F = 12°F
2. BTU/hr. = 40gpm x 60 x 8.33 x 12°F = 239,904 BTU/hr.
3. Ton Capacity = 239,904 BTU/hr. ÷ 12,000 = 19.992 Tons
4. Calculate BTU/hr.
BTU/hr. = Gallons per hr x 8.33 x rT°F
Solution: Required Size = 19.992 x 1.2 = 23.9904 or 25-Ton
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COLD SHOT
CHILLERS™.
14020 Interdrive West.
Houston, TX
77032
V - (281) 227-8400 / F - (281) 227-8404
mmarrone@waterchillers.com